<template>
  <div>
    <nav-bar>
      <div slot="left" class="back" @click="backClick">
        <img src="~assets/img/common/back.svg" alt="">
      </div>
      <div slot="center" class="title">
        <div v-for="(item,index) in titles" 
        :key="index" 
        class="title-item"
        :class="{active: index === currentIndex}" @click="titleClick(index)">{{item}}</div>
      </div>
    </nav-bar>
  </div>
</template>

<script>
import NavBar from 'components/common/navbar/NavBar'
export default {
  name:'DetailNavBar',
  components: {
    NavBar
  },
  data() {
    return {
      titles: ['商品','参数','评论','推荐'],
      currentIndex: 0
    }
  },
  methods: {
    titleClick(index) {
      this.currentIndex = index;
      this.$emit('titleClick',index);
    },
    backClick() {
      // this.$router.go(-1)
      this.$router.back()
    }
  }
 }
</script>

<style>
.title {
  display: flex;
  font-size: 13px;
}
.title-item {
  flex:1;
}
.active {
  color: red
}
.back img {
  margin-top: 12px;
}
</style>